Dobson units (DU) are the standard way to express ozone amounts in the atmosphere. One DU is 2.7 × 1016 ozone molecules per square centimetre, or 2.7 × 1020/m². One Dobson unit refers to a layer of ozone that would be 10 micrometre thick under standard temperature and pressure. For example, 300 Dobson units of ozone brought down to the surface of the Earth at 0 degrees celsius would occupy a layer only 3 mm thick.
Gordon Dobson was a researcher at the University of Oxford, who, in the 1920s, built the first instrument (now called the Dobson meter) to measure total ozone from the ground.
One Dobsonunit refers to a layer of ozone that would be 0.01 mm thick under standard temperature and pressure.
For example, 300 Dobsonunits of ozone brought down to the surface of the Earth at 0 degrees C would occupy a layer only 3 mm thick.
Gordon Dobson was a researcher at the University of Oxford who, in the 1920s, built the first instrument (now called the Dobson meter) to measure total ozone from the ground.
The Dobson spectrophotometers are used to check the results from the satellites, to extend existing long records of ozone monitoring (up to almost 40 years), and to provide a near simultaneous reference measurement for vertical profile measurements using ozonesondes.
Dobson spectrophotometers can also be used the derive vertical ozone profiles, the results of which do not have the detail of the ozonesonde.
The CSIRO began ozone measurements in Melbourne in 1956 in cooperation with the Bureau of Meteorology and in 1982 total responsibility passed to the Bureau.
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